chore: shave ~1-2s off pnpm test:types

`pnpm test:types` runs `nuxt prepare` before `vue-tsc`. In this repo, `nuxt prepare`
does not just generate `.nuxt` files, it loads `nuxt.config.ts`, installs modules,
and runs each module's `setup()`.

The `blog` module's `setup()` calls `loadBlogPosts()`, which calls `fetchBlueskyAvatars()`, which
hits the Bluesky API to fetch user avatars and writes those to disk. None of that is needed for type
gen or type checking. The blog already gracefully handles missing avatars.

We already had a pattern to conditionally skip expensive work during prepare. This uses the same
pattern here.

This does not break the actual blog build, because nuxt runs modules' `setup()` during build.

Author: serhalp

modules/blog.ts

@@ -87,7 +87,14 @@ function resolveAuthors(authors: Author[], avatarMap: Map<string, string>): Reso
  * Returns all posts (including drafts) sorted by date descending.
  * Resolves Bluesky avatars at build time.
  */
-async function loadBlogPosts(blogDir: string, imagesDir: string): Promise<BlogPostFrontmatter[]> {
+async function loadBlogPosts(
+  blogDir: string,
+  options: {
+    imagesDir: string
+    resolveAvatars: boolean
+  },
+): Promise<BlogPostFrontmatter[]> {
+  const { imagesDir, resolveAvatars } = options
   const files = await Array.fromAsync(glob(join(blogDir, '**/*.md').replace(/\\/g, '/')))
 
   // First pass: extract raw frontmatter and collect all Bluesky handles
@@ -120,8 +127,10 @@ async function loadBlogPosts(blogDir: string, imagesDir: string): Promise<BlogPo
     rawPosts.push({ frontmatter })
   }
 
-  // Batch-fetch all Bluesky avatars in a single request
-  const avatarMap = await fetchBlueskyAvatars(imagesDir, [...allHandles])
+  // Batch-fetch all Bluesky avatars in a single request when avatar resolution is enabled.
+  const avatarMap = resolveAvatars
+    ? await fetchBlueskyAvatars(imagesDir, [...allHandles])
+    : new Map<string, string>()
 
   // Second pass: validate with raw schema, then enrich authors with avatars
   const posts: BlogPostFrontmatter[] = []
@@ -150,13 +159,14 @@ export default defineNuxtModule({
     const resolver = createResolver(import.meta.url)
     const blogDir = resolver.resolve('../app/pages/blog')
     const blogImagesDir = resolver.resolve('../public/blog/avatar')
+    const resolveAvatars = !nuxt.options._prepare
 
     nuxt.options.extensions.push('.md')
     nuxt.options.vite.vue = defu(nuxt.options.vite.vue, {
       include: [/\.vue($|\?)/, /\.(md|markdown)($|\?)/],
     })
 
-    if (!existsSync(blogImagesDir)) {
+    if (resolveAvatars && !existsSync(blogImagesDir)) {
       await mkdir(blogImagesDir, { recursive: true })
     }
 
@@ -180,7 +190,10 @@ export default defineNuxtModule({
     )
 
     // Load posts once with resolved Bluesky avatars (shared across template + route rules)
-    const allPosts = await loadBlogPosts(blogDir, blogImagesDir)
+    const allPosts = await loadBlogPosts(blogDir, {
+      imagesDir: blogImagesDir,
+      resolveAvatars,
+    })
 
     // Expose frontmatter for the `/blog` listing page.
     const showDrafts = nuxt.options.dev || !isProduction